Constructive Plate Margin - GCSE Geography Definition

A constructive plate margin, also known as a divergent boundary, is where two tectonic plates are moving apart. This allows magma to rise from the mantle and create new crust as it solidifies. This process often occurs under the ocean, forming mid-ocean ridges such as the Mid-Atlantic Ridge. As the plates separate, the rising magma results in volcanic activity and the formation of new land structures. These areas can also experience earthquakes due to the tension and friction that builds up as the plates move.

In the AQA and OCR GCSE specifications, this is referred to as a constructive boundary, whereas in the Edexcel specifications, it is referred to as a divergent boundary.